FL-IGBT
IGBT Series Resonance Power Supply
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Medium Frequency Power Supplies · FL-KGPS
KGPS Parallel Resonance Thyristor Medium Frequency Power Supply
Rugged SCR parallel-resonance inverter, 100–2,500 kW, built for continuous foundry melting and tolerant of weak or noisy grids. Larger ratings built to order.
- Rides through voltage dips and distorted supplies
- Serviceable with standard thyristors available worldwide
- 12-pulse rectification above 1,000 kW — IEEE 519 compliant without filters
- Constant-power melting curve from cold charge to tap
- Zero-voltage soft start, no inrush on the grid
- Full protection: overcurrent, overvoltage, phase loss, water flow and temperature, earth leakage
- Output power
- 100 – 2,500 kW, larger to order
- Output frequency
- 150 – 8,000 Hz
- Rectifier
- 6-pulse (≤ 1,000 kW) / 12-pulse (> 1,000 kW)
- Input voltage
- 380 V / 660 V / 10 kV, 50 or 60 Hz
- Efficiency
- ≥ 92% at rated load
- Power factor
- ≥ 0.92
- Cooling
- Deionised closed-loop water, ≤ 40 °C inlet
- Protection
- IP20 cabinet, full alarm and interlock package
Model & Technical Parameters
Standard models below. Capacity, power and frequency are matched to your alloy, output and grid at the quotation stage — non-standard ratings are built to order.
| Model | Output power | Frequency | Input voltage | Rectifier |
|---|---|---|---|---|
| KGPS-160 | 160 kW | 1,000 – 2,500 Hz | 380 V | 6-pulse |
| KGPS-250 | 250 kW | 1,000 Hz | 380 V | 6-pulse |
| KGPS-500 | 500 kW | 500 – 1,000 Hz | 380 V | 6-pulse |
| KGPS-1000 | 1,000 kW | 500 Hz | 660 V | 12-pulse |
| KGPS-1500 | 1,500 kW | 350 Hz | 660 V | 12-pulse |
| KGPS-2500 | 2,500 kW | 250 Hz | 660 V | 12-pulse |
Technical values require confirmation against the final equipment configuration. Input voltage and frequency are built to the destination grid — specify 380 V/50 Hz, 400 V/50 Hz, 415 V/50 Hz, 440 V/60 Hz or 480 V/60 Hz at order. Medium-voltage units include the rectifier transformer.
Product Details
The KGPS uses a thyristor rectifier and a parallel-resonance inverter with a capacitor bank across the coil. It is the most forgiving topology in an industrial environment: it rides through voltage dips, tolerates a distorted supply, and survives the load swings of charging cold scrap onto a hot heel.
For an export customer the practical argument is serviceability. Thyristors, fuses and control boards are standard industrial parts available worldwide, and a competent local electrician can replace a device without factory support. Where after-sales response time is measured in days rather than hours, that is worth more than a percentage point of efficiency.
Supplied as a 12-pulse rectifier above 1,000 kW to keep harmonic distortion within IEEE 519 limits without an external filter.
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Send your alloy, target output per hour, working hours and grid voltage. You will get a capacity recommendation, a plant layout and a firm quotation — normally within three working days, no obligation.